Syringe and like article



June 18, 1929. L. ElsELE SYRINGE AND LIKE ARTICLE Filed Sept. 29, 192;?

5 ATTORNEYS Patented `lune 18, 19:29.

PATENT OFFICE.

LOGAN EISELE, 0F NASHVILLE, TENNESSEE.

SYRINGE AND LIKE ARTICLE.

Application led September 29, 1927. Serial No. 222,771.

This invention is an improvement in syringes and like articles, and more particularly in that type wherein the motive power 1fqr the liquid is a bulb of rubber or the In the usual construction of articles of this character, such as syringes, pipettes, droppers and the like, a tube of glass o r like material is provided for the barrel, and a bulb is connected to one end thereof for pumping the liquid, the other end being usually reduced to provide a directing nozzle.

ln preferred construction, the end of the barrel with which the bulb is connected is flaring, and the bulb usually of spherical outline, has a nipple fitting within the end of the barrel, the flaring portion facilitating the entrance of the nipple, and the nipple is of sufficiently rigid construction to provide a tight engagement between the parts.

ln operation, the barrel body is held bctween the index and second ngers, with the thumb on the bulb. To load the barrel, the bulb is compressed toward the flaring end. When now the tip of the instrument is dipped in the liquid, andthe pressure on the bulb relaxed, liquidwill be forced into the barrel. A reversal of this operation will eject the liquid.

The relative arrangement of flaring end and pump enables a very thorough emptying of the bulb of air when drawing in or ejecting liquid, and the instrument is very oo nvleniently handled because of the special s a e.

lhless, however, the instrument is held with the nozzle elevated while the barrel is loaded with liquid, said liquid tends to pass into the bulb, which is not desirable for reasons which will be obvious. In order to prevent, or at least to limit the flow into the bulb in case of inversion, the opening through the nipple has been made small, and in multiple, but such arrangements merely slow the flow of liquid, and do not prevent the entrance thereof to the bulb when the parts are properly positioned for such flow.

One o f the primary objects of the present invention is the provision in an instrument of the character specied, of means in connection with the bulb, and operated by compression and expansion thereof, for sealing the outlet of the bulb at the end of the nipple, except during the discharge of air therebody. Y

Another object isthe provision in such a construction of a closure for the nipple end so connected with the bulb, that the expansion thereof positively operates the closure to seal the outlet from the bulb.

With these and other objects in view the invention consists in the construction and novel combination of parts fully described hereinafter, illustrated in the accompanying drawings, and pointed out in the claims appended hereto, it being understood that various changes in the form, proportion, size and minor details of construction within the scope of the claims, may be resorted to without departing from the spirit of the invention.

In the drawings forming a part hereof is shown a longitudinal section of one end of an instrument constructed in accordance with the invention.

The present embodiment of the invention is shown in connection with an instrument of the syringe type, including a barrel l of glass or the like, having one end flaring as shown at 2, and the other end provided with a suitable discharge nozzle not shown.

The bulb 3 usually of soft rubber, is spherical, and has a nipple 4; which is adapted to lit within the end of the barrel. The nipple as shown has a relatively thick wall, in order to provide for a lirm connection between the barrel and the bulb.

In operating the device, the barrel is held between the index and second lingers, with the thumb on the bulb. The bulb is compressed as indicated in dotted lines in the drawing, which expels air from thc bulb, and when the presssure is relaxed, it will be obvious that air will be drawn through the barrel into the bulb. l If the dispensing end of the barrel is immersed in liquid at this time, the air pressure on the liquid will force a part thereof up into the barrel.

So long as the instrument is held with the bulb upward, or at a considerable higher level than the dispensing end, the liquid will remain in the barrel, but if the instrument is inverted, a part of the liquid will flow into the bulb through the opening in from to eject the liquid from the tubular the nipple.

In order to positively prevent entrance of liquid to the bulb, a closure is provided for the end of the nipple, operated to open and closed position by compression and expansion of the bulb. f

As shown, the closure is a valve 5 of substantially conical shape, tting a similarly shaped seat 6 at the end of the bore of the nipple. The valve is connected to the bulb by a stem 7, the said stem( extending diametrically of the bulb, and being con nected with the wall thereof at a point in the axis of the nipple, as indicated at 8. It will be obvious that when the bulk is compressed by the thumb 'as above described, the valve will be moved away from its seat to enable the escape of'air, and will be held away from its seat, until `the bulb is released. The expansion of the bulb returns the valve to its seat, making a tight closure, so that no liquid can flow from the barrel into the bulb.

The improvement is applicable for use in any character of instrument of the syringe type, such as hydrometers, aspirators, battery filling apparatus, and suction devices of every character. It is also applicable for use with breast pumps, infant feeders,

evacuators, pipettes, droppers, and syringes of every character.

What is claimed as new is 1. An instrument of the character specified, comprising a resilient collapsible bulb having a substantially rigid discharge nipple, a valve engaging the outer end of the nipple and having a stem extending through the saine and connected with the bulb wall at the opposite side for the purpose specified, said nipple adapted to engage the barrel of a dropper, or the like.

2. An instrument of the character specilied, comprising a resilient collapsible bulb having a substantially rigid discharge .nipple, a valve engaging the outer end of the nipple and having a stem extending through the same and connected with the bulb wall at the opposite Side for the purpose specied, said nipple adapted to engage the barrel of a dropper, or the like, the outer end of the bore of the nipple being flaring, and the valve conical to itl against the same.

Signed at New York city in the county of New York and State of New York this 28th day of Sept. A. D. 1927.

LOGAN EISELE. 

